* Without any damage to the lock, it can open a majority of cross key lock quickly and technically.

* There're 2 pcs with different diameter  in a set, 2.0mm and 2.3mm.
  Diameter is 2.0mm ---- works on the little Cross Lock.
  Diameter is2.3mm ----  works on the  big Cros Locks

*Using Method:
Insert the cross opener into the lock and knobbing with the hammer from the end.
It can be used to knob out the circlip from the Trail piece. The circlip is the tool to drive the Trail Piece.
Then the tip of the cross opener can enter the lock cylinder and hold on the Trail Piece directly.
Turning the opener,  the lock can open .